adds an empty state if there is no datasource selected.

packages/standard-components/src/List.svelte

@@ -4,6 +4,7 @@
 
   const { API, styleable, DataProvider } = getContext("sdk")
   const component = getContext("component")
+  console.log($component)
   const dataContext = getContext("data")
 
   export let datasource = []
@@ -24,9 +25,23 @@
 </script>
 
 <div use:styleable={$component.styles}>
+  {#if rows.length > 0}
     {#each rows as row}
       <DataProvider {row}>
         <slot />
       </DataProvider>
     {/each}
+  {:else}
+    <p>Feed me some data</p>
+  {/if}
 </div>
+
+<style>
+  p {
+    display: grid;
+    place-items: center;
+    background: #f5f5f5;
+    border: #ccc 1px solid;
+    padding: var(--spacing-m);
+  }
+</style>